. The miscellaneous botanical works of Robert Brown [microform] : vol. I, containing I. geographical-botanical, and II. structural and physiological memoirs. Botany; Botany; Botany; Botany; Plant anatomy; Botanique; Botanique; Botanique; Botanique; Botanique. 406 ON THK i'EMALE FLOWER AND FRUIT OP though ill several of the specimens examined tliey were i>;reatly altered in appearance, from a coating of mucous matter taken iij) and again deposited by the spirit in which the specimens were preserved.^ A shght difterence, indeed, seems to exist l)etween the tissue of the apices of the styles a
. The miscellaneous botanical works of Robert Brown [microform] : vol. I, containing I. geographical-botanical, and II. structural and physiological memoirs. Botany; Botany; Botany; Botany; Plant anatomy; Botanique; Botanique; Botanique; Botanique; Botanique. 406 ON THK i'EMALE FLOWER AND FRUIT OP though ill several of the specimens examined tliey were i>;reatly altered in appearance, from a coating of mucous matter taken iij) and again deposited by the spirit in which the specimens were preserved.^ A shght difterence, indeed, seems to exist l)etween the tissue of the apices of the styles and the otlier parts of their surface; hardly sufficient, how- ever, to prove it to be stigma, though this is no doubt the probable seat of tliat organ. The next point of importance in the female flower oi Rqfflc' 8ia is the structure and gradual development of the ovula. These, in the earliest state ol)served, consist of merely conical or subcylindrical papilla?, having a perfectly smooth surface as well as uniform internal substance. The first perceptible change taking place in the papilla is a slight contraction at its summit, the upper minute con- tracted apex being the rudiment of the nucleus, liivnii. diately below this contracted portion a dilatation is soon observable, which, gradually enlarging and becoming slightly hollowed, forms a cup in which the nucleus, also propor- tionally increased in size, is ])artly immersed. This cup, the rudiment of the future integument, continues gradually to enlarge, until it completely covers and extends consider- ably beyond the nucleus, but without cohering with it. If a transverse section is made near the slightly depressed -'-'0] apex of tliis integument, an extremely minute perforation or capillary channel, extending to the free apex of the in- cluded nucleus, may be observed. This account of the gradual development of the ovuluni of llaj/lena, I believe, is in every essential point applicable to Pha3nogamous plants generally, exce
Size: 1122px × 2227px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjectplantanatomy
